I stabilised my rtl sdr stick with an external 28.8MHz signal which is locked to a 10MHz gps disciplined ocxo. The only thing i buyed was the 28.8 MHz crystal (https://www.mouser.de/ProductD…CEO%252BqkQSOruaeLQ%3D%3D). Circuit: 28_8MHz_Ref.PDF, Arduino code: adf4001_28_8_MHz_Attiny85.txt
73
Andreas
Hello Achim,
did this in a similar way a few times. I did not insert R1 and R2 but removed C1 and C2.
Worked ok
73
Andreas
PA3FYM That sounds great. Could you share your code or post it in the eevblog forum? I think readers of the lars gpdso forum are interested in this improvements, especially the auto mode for the TC setting. Lars himself passed away last year, so he can not do any changes.
I am using an adf4351 board . The 3rd harmonic is very strong and gives a nice and clear signal.
PA3FYM Thats very interesting. Could you explain where you did improvements in the code or share your code?
SV1BDS PA3FYM I was not satisfied with all the easy solutions too. I am using know a system with arduino, ocxo an 1pps which is described here: https://www.eevblog.com/forum/…o-and-1ns-resolution-tic/
Very clever and good working.
Thanks !!!!!
I am so stupid.....Who can read has clearly an advantage....In the manual of pe1cmo is described how this connection can be made. At the lnb input only a dc blocking capacitor and a 470 R resistor in series have to be connected. From there you can connect a sdr rx. Thats all!
Hello,
does anybody know where at the receiving chain (before the receiving mixer) a sdr rx can be connected in parallel to the transverter solution from Rene?
73 Andreas
do1ctl Sorry to hear that. So I am a lucky man. Perhaps they gave me a pigtail, because i already modified the transvertert a little bit????
do1ctl DL5RDI I should tell that i modified my unit before sending it back. I mounted a bnc socket and a spdt switch in the front panel and did some changes on the main unit because i wanted to modify it myself before i knew that the transverter would be updated. I asked misses Grüner from Kuhne if i lost my warranty with these mod. She denied and said i could send it back. So I sent it back but undid the changes at the main unit for the mod which was now done by Kuhne. Perhaps they where so impressed by my mechanical skills (drilling two nearly round holes in the front panel without destroying the transverter) that they gave me these short cable, 
Perhaps you should asked Kuhne if they forgot these cable.
PA3FYM Is it possible to get the circuit diagram from your downconverter 739MHz to 432 MHz? In the photo you have posted somewhere else in the forum i can not identify all components. Thanks a lot!!!!
Hi All,
waiting for upgrading the Kuhne converter; lot of fm.
Station on air remotely via internet since 2 days.
TX: remoteham software server rcforb server (at home remotehamsoftware client rcforb client), FT817, Kuhne upconverter, 11m cellflex, wlan gridantenna
RX: spyserver software (at home sdrsharp), asirspy mini rx, 10m sat cable, 60cm offset dish, lnb with 25mhz injected from a gps disciplined oscillator connected to a 25mhz pll from df9np
computer at serversite: samsung thin client tx-wn, win7 embedded: very old, very cheap from ebay
works fine here
73 de Andreas, DL5MGD
dl3hm PR8KW Great work, thanks!!! Ist it possible to use this scripts with sdr sharp, especially with the spyserver? My setup is:
remotesite: Antenna - RX (airspy mini) - spyserver - internetconnection
at home: listening/control via sdrsharp over the internet.
It would be great to do the drift correction with sdr# or the spyserver.
Andreas, DL5MGD
PA3FYM Thanks!!!
104mm are ok.
@Mike5000 Hi, you can simply define a new reference frequency for the si5351 by using the etherkit library.
unsigned long long pll_freq_clk0 = 80000000000ULL; //internal vco si5351, best if even multiple from freq_clk0
unsigned long long freq_clk0 = 2500000000ULL; //desired output frequency
unsigned long SI5351_CLK0 = 10000000; //reference frequency si5351
si5351.set_freq_manual(freq_clk0, pll_freq_clk0, SI5351_CLK0);
But in my case the output is not clean enough. So i replaced the si5351 with the circuit from df9np with an vcxo and an adf4001 locked to the 10MHz ocxo disciplined via gps.
Kühne transverter: adf4360-1 pll with 20MHz TCXO
Controller: atmega 8.
